FVWM[1] is a powerful and highly configurable desktop window manager for the X Window system. It supports any number of virtual desktops, each divided into multiple pages. It also supports side title bars, including vertical text.

Figure 6.7a: FVWM Running on PC-BSD®

Figure 6.7b: FVWM-Crystal Running on PC-BSD®

When you install FVWM on PC-BSD®, it also installs FVWM-Crystal[2]. Both window managers will be added to the login menu. Figure 6.7a shows the default PC-BSD® desktop if you select FVWM from the login menu. The application menu was opened by clicking the mouse anywhere on the desktop. Figure 6.7b shows the default PC-BSD® desktop if you select FVWM-Crystal from the login menu. To open an xterm in FVWM-Crystal, right-click any area of the desktop.

This article[3] provides a good overview of the features and configurable options for FVWM-Crystal.